Risclog-sqlalchemy

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- Nothing changed yet.

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- Drop support for Python 3.3.

- Reintroduce `RoutingSession.using_bind` as it is needed for executing queries
in multi database environments. It was removed in version `2.0`.

- Pin to `zope.component < 4.4.1` for now as we are using a private variable
from this package which has been removed lately.

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- Add the fixture ``.fixtures.database__selenium_testing`` to switch SQLAlchemy
session handling to into the same way the live server does it. Using this
fixture leads to `DetachedInstanceError` exceptions when using a database
object after the commit. It has to be fetched again from the database.

- Omit files from sdist which are related to buildout, testing or mercurial.

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- Support Python 3.6 and PyPy3.

- Fix `setup.py` to no longer use absolute paths.

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- Add compatibility to `pypy`.

Also removed explicit dependency to `psycopg2` as it's a PostgreSQL specific
dependency and not compatible with pypy. You will need `psycopg2cffi` in
order to run `risclog.sqlalchemy` with `pypy`.

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- Removed ``RoutingSession.using_bind``, require SQLAlchemy >= 1.0. (13968)

- Updated API calls to alembic, require alembic >= 0.7. (13968)

- Added documentation. (13952)